Avoid Altitude Sickness in Tibet
It is not surprising that people feel unwell when travelling to high altitude where there is so much less oxygen in the high mountains. Above 2500m, the symptoms of altitude sickness become more noticeable.
"altitude sickness" can describe any altitude-related illness. After people have ascended to high altitude, they are affected very quickly by three forms of altitude sickness called Acute mountain sickness, High altitude cerebral oedema and High altitude pulmonary oedema.
In fact the term "altitude sickness" can be used to describe any altitude-related illness. There are three forms of altitude sickness that can affect people very quickly after they have ascended to high altitude. People who live at altitude for many years may be at risk of developing another illness, called chronic mountain sickness.
It doesn't become noticeable until tourits have been at the altitude for a few hours. It is difficult to predict who will be affected. Fit and healthy people have been badly limited by symptoms of acute mountain sickness, while their older companions have felt fine.
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